Don't consider tag refs as valid for branch name (#11847)

Co-authored-by: techknowlogick <techknowlogick@gitea.io>

modules/git/commit.go

@@ -468,7 +468,7 @@ func (c *Commit) GetSubModule(entryname string) (*SubModule, error) {
 
 // GetBranchName gets the closes branch name (as returned by 'git name-rev --name-only')
 func (c *Commit) GetBranchName() (string, error) {
-	data, err := NewCommand("name-rev", "--name-only", "--no-undefined", c.ID.String()).RunInDir(c.repo.Path)
+	data, err := NewCommand("name-rev", "--exclude", "refs/tags/*", "--name-only", "--no-undefined", c.ID.String()).RunInDir(c.repo.Path)
 	if err != nil {
 		// handle special case where git can not describe commit
 		if strings.Contains(err.Error(), "cannot describe") {